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Ishaan comments on Open Thread, Apr. 27 - May 3, 2015 - Less Wrong Discussion
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I've been doing the same thing for ~40 minutes of daily peak sunlight, because of heuristics ("make your environment more like the EEA") and because there's evidence it improves mood and cognitive functioning (e.g.). The effect isn't large enough to be noticeable. Sunlight increases risk of skin cancer, but decreases risks of other, less-survivable cancers more; I'm not sure how much of the cancer reduction you could get from taking D3 and not getting sunlight. I guess none of that actually answers your question.
My vague and untrustworthy impression is that D3 supplementation is better than nothing but has risks related to calcium going to the wrong places, which may be mitigated by Nitric oxide which is also sun linked, and might also be mitigated by not being K2 and magnesium deficient which most people are. I should probably start being better about archiving what I read so that I can stop being vague and untrustworthy.
I do notice a muscle and general relaxation effect which is deeper and lasts longer than, say, an equally warm shower. A blood panel I got back when I was not supplemented said I was pretty severely D deficient, so it might be that I feel the effects more. (Though from what I know of the biology of this the NO is more likely to be responsible for the relaxation effect than the D3.)